Day looks more beautiful when it has sprinkles of their presence.Life looks more colorful with their being around.
But it wont be true to say that it happens because of no reasons.The reasons are there but probably unknown to our heart.Probably a nice soul can touch anybody's heart but who gets impacted is at God's discretion.
Not every relationship needs to have a reason or purpose, some are just naive like the smile of a toddler.